<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->

    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>

      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>

            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" href="javascript:void(0);" @click="searchOne('')">全部</a>
                </li>

                <li
                  v-for="(item,index) in subjectNestedList"
                  v-bind:key="index"
                  :class="{active:oneIndex==index}"
                >
                  <a
                    :title="item.title"
                    href="javascript:void(0);"
                    @click="searchOne(item.id, index)"
                  >{{item.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>

          <dl>
            <dt>
              <span class="c-999 fsize14" />
            </dt>

            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li
                  v-for="(item,index) in subSubjectList"
                  v-bind:key="index"
                  :class="{active:twoIndex==index}"
                >
                  <a
                    :title="item.title"
                    href="javascript:void(0);"
                    @click="searchTwo(item.id, index)"
                  >{{item.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>

          <div class="clear" />
        </section>

        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>
              /
              <i class="c-666 f-fM">1</i>
            </span>
          </section>

          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{'current bg-orange':buyCountSort!=''}">
                <a title="关注度" href="#" @click="searchBuyCount()">关注度</a>
              </li>

              <li :class="{'current bg-orange':gmtCreateSort!=''}">
                <a title="最新" href="#" @click="searchGmtCreate()">最新</a>
              </li>

              <li :class="{'current bg-orange':priceSort!=''}">
                <a title="价格" href="#" @click="searchPrice()">
                  价格&nbsp;
                  <span>↓</span>
                </a>
              </li>
            </ol>
          </section>
        </div>

        <div class="mt40">
          <!-- /无数据提示 开始-->

          <section class="no-data-wrap" v-if="Number(data.total) === 0">
            <em class="icon30 no-data-ico">&nbsp;</em>

            <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
          </section>

          <!-- /无数据提示 结束-->

          <article class="comm-course-list" v-if="data.total>0">
            <ul class="of" id="bna">
              <li v-for="course in data.records" :key="course.id">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img :src="course.cover" class="img-responsive" :alt="course.title" />

                    <div class="cc-mask">
                      <a :href="'/course/' + course.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                    </div>
                  </section>

                  <h3 class="hLh30 txtOf mt10">
                    <a
                      :href="'/course/' + course.id"
                      :title="course.title"
                      class="course-title fsize18 c-333"
                    >{{course.title}}</a>
                  </h3>

                  <section class="mt10 hLh20 of">
                    <span class="fr jgTag bg-green" v-if="Number(course.price) === 0">
                      <i class="c-fff fsize12 f-fA">免费</i>
                    </span>

                    <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">{{course.viewCount}}</i>
                      |
                      <i class="c-999 f-fA">9634评论</i>
                    </span>
                  </section>
                </div>
              </li>
            </ul>
            <div class="clear"></div>
          </article>
        </div>

        <!-- 公共分页 开始 -->
        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
            <!-- .prevent表示阻止了原来a标签的行为,执行我们自定义方法 -->
            <a
              :class="{undisable: !data.previous}"
              href="#"
              title="首页"
              @click.prevent="gotoPage(1)"
            >首页</a>

            <a
              :class="{undisable: !data.previous}"
              href="#"
              title="前一页"
              @click.prevent="gotoPage(data.current-1)"
            >&lt;</a>

            <a
              v-for="page in data.pages"
              :key="page"
              :class="{current: data.current == page, undisable: data.current == page}"
              :title="'第'+page+'页'"
              href="#"
              @click.prevent="gotoPage(page)"
            >{{ page }}</a>

            <a
              :class="{undisable: !data.next}"
              href="#"
              title="后一页"
              @click.prevent="gotoPage(data.current+1)"
            >&gt;</a>

            <a
              :class="{undisable: !data.next}"
              href="#"
              title="末页"
              @click.prevent="gotoPage(data.pages)"
            >末页</a>

            <div class="clear" />
          </div>
        </div>
        <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>

<script>
import courseApi from "@/api/course";
export default {
  data() {
    return {
      page: 1,
      data: {},
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [], // 二级分类列表
      searchObj: {}, // 查询表单对象

      oneIndex: -1,
      twoIndex: -1,
      buyCountSort: "",
      gmtCreateSort: "",
      priceSort: ""
    };
  },
  created() {
    // 初始化第一页
    this.initCourse();
    this.initSubject();
  },
  methods: {
    // 1 查询第一页数据
    initCourse() {
      courseApi.getCoursePageList(1, 8, this.searchObj).then(response => {
        this.data = response.data.data;
      });
    },
    // 2 初始化一级分类
    initSubject() {
      courseApi.getAllSubject().then(response => {
        this.subjectNestedList = response.data.data.list;
      });
    },
    // 3 切换分页的方法
    gotoPage(page) {
      courseApi.getCoursePageList(page, 8, this.searchObj).then(response => {
        this.data = response.data.data;
      });
    },
    //点击一级分类，显示对应的二级分类，查询数据
    searchOne(subjectParentId, index) {
      //debugger

      this.searchObj.subjectId = "";
      this.subSubjectList = [];

      this.searchObj.subjectParentId = subjectParentId;
      this.gotoPage(this.page);

      for (let i = 0; i < this.subjectNestedList.length; i++) {
        if (this.subjectNestedList[i].id === subjectParentId) {
          this.subSubjectList = this.subjectNestedList[i].children;
        }
      }
    },
    //点击二级分类，查询数据
    searchTwo(subjectId, index) {
      this.twoIndex = index;
      this.searchObj.subjectId = subjectId;
      this.gotoPage(this.page);
    },
    //购买量查询
    searchBuyCount() {
      this.buyCountSort = "1";
      this.gmtCreateSort = "";
      this.priceSort = "";
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(this.page);
    },
    //更新时间查询
    searchGmtCreate() {
      // debugger;
      this.buyCountSort = "";
      this.gmtCreateSort = "1";
      this.priceSort = "";
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(this.page);
    },
    //价格查询
    searchPrice() {
      this.buyCountSort = "";
      this.gmtCreateSort = "";
      this.priceSort = "1";
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(this.page);
    }
  }
};
</script>
<style scoped>
.active {
  background: #bdbdbd;
}
.hide {
  display: none;
}

.show {
  display: block;
}
</style>